Malicious PDF — malware analysis report

Static analysis result for SHA-256 073e591cef913b02…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 02:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fd572e6894f73465294b1bf3001137f SHA-1: 283c9050659cad44aad8156b54b1d3f271c4eaab SHA-256: 073e591cef913b029d5a664e8da83abed44dd9794f706ac12eaac2e458c608de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ddna6ramkqf01gsn34ejte70dt/62797463761.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/vhgv9hpnim1svui5cn00blv9mp/tugajaluzoziwafog.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/zafufovoz.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9002897723---wavumopuzatotijuvix.pdf
    • http://openendrep.com/userfiles/files/tawutotasupomezejes.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609635d1c359a---tejesimexivalisowos.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/26429600d3def083add85ffc2a922dea/19865632743.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43309946097.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ef2b92d269ac434191c7bd4704354d35/renubotimifonali.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/o4m1tnibbsfs4e6ntke308addt/tidawixoxufuko.pdf
    • https://euroroma-bg.org/files/file/4302810240.pdf
    • http://abwferrellpkwy.com/uploads/files/39983952904.pdf
    • http://group-anons.ru/userfiles/files/99137165532.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/04e39c8afdce73949ac9bad9cbc06565/34175832155.pdf
    • https://vipbeachhouse.com/uploads/editor/file/64984687518.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6c62747797cd2dfc77005010b1a518d7/18971335101.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed912c0ce---nozidaredegilaneweleme.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa97bd3d01---pipofesu.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/74619926334.pdf
    • http://iburgisidimarsala.eu/userfiles/files/rafogoki.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607279d3d60bf---64345403514.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=get+up+for
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e392.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 16792 bytes
font_01_sfnt_off0000fba4.bin
a4dd8e09bdd1fdb9d8dffc387dbd4a705b860f58cd3345678862101d78029cf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 29876 bytes
font_02_sfnt_off000137ab.bin
7cc5aa1eb917a7eac3972bee2ee06c67cb50db624e1a54e05dcc5c86e7a2286c
pdf-font-stream PDF embedded font (sfnt) at offset 0x137AB 9920 bytes
font_03_sfnt_off00014db0.bin
09562ca2d5000ae2f2345c4ffb282664df80e6add20478162cc85c395b82892d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB0 16120 bytes